23
To take readings:
1.
Rinse the pH electrode with deionized or
distilled water before use
to remove any
impurities adhering to the probe body. If
the pH electrode has dehydrated, soak it
for 30 minutes in electrode storage solution
or a 2M–4M KCl solution.
2.
Press ON to switch on meter. Press
MODE key
to select pH measurement
mode. The MEAS annunciator appears
on the top center of the LCD. The ATC
indicator appears in the lower right hand
corner to indicate Automatic Temperature
Compensation. If the ATC indicator does
not appear, make sure DO probe is
plugged into the meter.
See figure
3.
Dip both the pH electrode and the DO
probe into the sample.
When dipping the pH electrode into the
sample, the sensor or the glass bulb of the
electrode must be completely immersed into
the sample. Stir the probe gently in the sam-
ple to create a homogenous sample.
4.
Allow time for the reading to stabilize.
Note the reading on the display.
5.
Press the MODE key
to toggle between
modes:
• pH
• % saturation.
• mg/l (ppm)**
Taking pH Measurements
Be sure to remove the protective rubber cap on the electrode before measurement.
To ensure Automatic Temperature Compensation (ATC) for pH measurements, the
DO probe must be plugged in and must be immersed into the sample you wish to
take pH readings.
pH
ATC
MEAS
C
A
A
5.3
**To select between mg/l and ppm units, see page 52.
The ATC indicator should appear in the lower right hand corner of the display.
If it does not, this indicates an error.
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